ERRATA

VERSION 1 Page 21: The "Search Type" sidebar says "check the other image type," it should read "check the other search type." Page 68: The Portuguese Mile is listed as being 2.0873 miles, it should be 1.2786 miles, and the Russian Mile is listed as 1.297 miles, it should be 4.64 miles. Page 275: the web address should read certitudes.org rather than certitude.org. All "Solve it Yourself" pages: the format of the answers should be in decimal minutes, not decimal degrees.

VERSION 2 Page 16: Following changes at geocaching.com, the web url in the second side bar should read "tlnMasters/pattern-topo.jpg." Page 24: The first line should read "western half of the United States," not "eastern." Page 30: In an effort to clarify that puzzle I have changed the equations to "50.5 + X.0," and "11.9 + YY.0." Page 78: The second element in the list should be "Silicon," not "Carbon," and the fourth should be "Oxygen," not "Iron." Page 79: It should read "Silicon = 14," rather than "Carbon." Page 174: the H in "CACHE" should be encoded AABBB, not AAAAA. Page 188: The "Color Vision" sidebar says "8 bits of storage per color," it should read "per pixel." Page 247: The checklist should be titled "Lateral Thinking." Page 275: the first web address should be certitudes.org, the second should be evince.locusprime.net.